Metabones T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Micro Four Thirds-Mount Camera (MB_SPEF-M43-BT4) 4PC Accessory Kit Canon EF Lens to Micro 4/3 Body; Full-Frame Lens to Micro 4/3 Camera Body Supports In-Camera Aperture Control; 0.71x Micro 4/3 Crop Factor Compensation 1-Stop Increase in Lens Apertures; 5 Optical Elements in 4 Groups Locking Mechanism to Secure Lens; Push-Button Lens Release Brass Mounting Rings; Detachable Tripod Foot